Arduino

Official Arduino Discord - Discuss all things Arduino!

Join

Arduino

Official Arduino Discord - Discuss all things Arduino!

Join

hardware-help

coding-help

official-product-help

project-showcase

general-help

pcb-help

adafruit-help

official-product-help

robotics-help

sensors-help

coding-help

hardware-help

esp-help

pi-help

i2c-serial-help

חווה יתמין

9/18/2025

LNA help

Hi I know almost nothing about communication and RF. I want to strengthen my antenna signal. My antenna is TX only. I saw this thing (see picture) and I'm not sure it's the right thing I need to use to strengthen my antenna signal. What component should I use?...

wassermelone

9/18/2025

GPS Neo8M Help

I'm trying to use an ESP32 (NodeMCU-32S) to connect to a GPS (Neo8M) to be able to read location data. The issue I have at the moment is I believe it isn't transmitting any data or even connecting. I may have messed up the wiring somehow, an issue with power or the Neo8M. I have the Neo8M connected to the esp32 at RX2 and TX2, connected properly to ground and the siderail of the breadboard to 3v3 power. It isn't showing anything or locking on to a satellite at all really. Any help?

Susour

9/16/2025

Creating a Smart Dustbin but stuck in detecting a mix of wet and dry waste?

A sensor or camera detects when a user approaches to dispose of an item. The system performs an initial visual scan to analyze the waste. If it detects a mixture of both wet and dry waste, even if it is inside a plastic bag, the lid will not open. For acceptable waste (either entirely wet or entirely dry), the main lid unlocks, granting access to the next stage. After the first lid opens, the user places the waste onto a secondary internal platform. An array of moisture sensors on this platform then determines if the item is wet or dry. Based on the data from the moisture sensors, a servo motor is activated. The servo motor rotates the platform or a flap, directing the waste into its designated internal compartment for either wet or dry collection....

vLyrinx

9/16/2025

Flightsim A320 Radio panel (complete newb)

Hello all, I wanted to get my hands on a A320 Radio panel and decided on the route of 3d printing one from online which had a parts like and things. Only problem is Im a complete newb ordered all the parts and I have No idea how anything goes together. i do have experience soldering and actually doing it. But have no clue how to actually wire everything up correctly for the arduino and the switches etc... Here is the link for what i'm making: https://www.printables.com/model/1126963-airbus-a320-radio-panel-rmp#hardware...

…Aarav…

9/16/2025

Fixing PC

Fixing starc pc

nekko

9/15/2025

LED only turns off when both buttons pressed

I’m testing out the logic behind MOSFET BS170 gates on my arduino but I think I’m confused.. I’m trying to get the LED to turn off when both buttons are pressed not just one but so far I’ve only been able to get it to where pressing one of the two buttons turns off the LED. I tried making an NAND gate and a standard AND gate but it won’t work.. Looking for some tips/guidance on the topic. Below is my test circuits that didn’t work.

Franscis123$#

9/12/2025

DFROBOT SER0019 Servo doesn't works

I'm trying to use the DFROBOT SER0019 Servo but it doesn't works, it just has a lightly vibration, sounds very low. You should ear it at max volume and close to the speaker at least. I made the image like that because my phone hasn't a good camera resolution, a photo directly to the Arduino doesn't looks clearly. The code related to servo:...

Maddie

9/12/2025

Relay not working with pumps

im using a 12v battery power supply (those for drills) for testing. Heres my wiring setup: Arduino VCC-> 12v relay VCC arduino gnd -> relay gnd ...

…Aarav…

9/12/2025

Continuation of lcd display error

This is an continuation of @Graphite s problem

VectorVoyager

9/11/2025

RP2350 based PCB review

I would be glad if you can review my RP2350 based PCB: https://github.com/semitov/rp2350-gpio-card

confidential_

9/10/2025

Dedicated CC/CV modules for charging 18650 batteries?

I am not very familiar dealing with 18650 batteries. Its a very simple 3 cell 18650 in series managed by a HX-3S-01 BMS. I am planning to add USB C PD charging functionality along with smart battery charging features like constant current and constant voltage switching because thats how li ion batteries are supposed to be charged. There are readymade solutions like this https://www.amazon.in/Step-Up-Overvoltage-Protection-Charging-Applications/dp/B0FDRCMWT8 but they simply take in 5v3a usb input and boost it to 12v along with the cc/cv switching functionality to charge it which is not usb PD. I also found the XL4015 module that chatgpt sent me but isint that just a buck converter? so I have to manually change the settings instead of it automatically switching between CC and CV? or am i wrong?...

Tamerlan

9/8/2025

Matrix Wiring help

Hey everyone—looking for some advice. I’ve got six 128×64 flexible LED matrices and I want to run them as two channels, with three panels daisy-chained per channel acting as one continuous display. I tried a Raspberry Pi Pico with a HUB75 adapter and also an Adafruit hub, but ran into a bunch of issues. Not sure if it’s my wiring or the software stack. If you’ve done something similar, what hardware/driver stack would you recommend? Any tips on a reliable setup (controllers, level shifting, libraries, examples) would be super helpful. Happy to hop on a quick call if someone’s willing to walk me through it. Links to the exact parts are below—thanks! Full Color LED Panel, 128x64... https://www.amazon.com/dp/B0CH9BQTKW?ref=ppx_pop_mob_ap_share...

…Aarav…

9/7/2025

ESP 32 over voltage popping sound

so, I plugged my esp 32 into an power source, which is probably slow, the exact wattage is unknown, and then I heard an POP! The circut was on an breadboard, on which the rails were slightly Brocken, the esp 32 was connected to an separate dev board, which smells like an PCB cut in half (I’ve done it before) . So, I want to know, what got fried, if possible, and is it safe to plug in? The esp status led was always . The Esp32 is not hot, or smelly.

LGSNS

9/7/2025

PCA9685 16 Channel Servo Driver Power Supply

I'm planning on doing a project using 8 SG90 servos with the PCA9685. What li-po batteries (or any kind of external power supply) would you guys recommend?

Ryan Bardsley

9/6/2025

Portenta USB-C cable compatibility?

I am trying to incorporate a Portenta H7 Lite Connected as the main processor in a sensor I am building. I was originally placing the H7 in an enclosure with the USB-C connector integrated so a USB-C cable can easily be inserted into it. The sensor would be used by customers, and what I am finding is that there is (well, WAS) only a single combination of cables that I could get to work. The cable that used to work was a USB-C to USB-A adapter connected to a USB-A to USB-C cable that I connect to my new MacBook Pro. Because the Portenta H7 has a USB-C connector on it, any customer that is using my sensor will assume that any USB-C cable can be connected. This is not the case. So, to fix this, I created a USB-C breakout board that fakes a USB-2.0 4-pin connection using VBUS, GND, D+, D− only to communicate with the Portenta H7. This worked, but only temporarily. Having taken a week-long break from this project, the SAME hardware which used to connect my H7 + USB-C-to-2.0 PCB adapter to my MacBook Pro now no longer works. ...

Bananaman

9/6/2025

could anyone help me learn how to use a 8*8 Led matrix?

I looked online, asked chatgpt and other stuff for hours, and it doesn't want to work

Etienne

9/6/2025

Diy speaker

Hey, how can I make this work? I want to turn the earbuds into a speaker.

…Aarav…

9/6/2025

Relay Pinout

I have this relay, and I can’t seem to figure out the Pinout. The pin header pins are +-/s

VaporGame

9/5/2025

Need someone with a ESP32-S3 based board to help me debug a bare metal issue

I am working on a project targetting the ESP32-S3 on bare metal, but im having weird issues on real hardware, that don't happen in wokwi. I only have a M5stick s3 on hand, but wokwi is emulating a esp32-s3 devkit-c1. I'd appreciate anyone testing it on any esp32-s3 based board, and I'd love to accept pull requests to add more board support, even though the ESP32-S3 port of my project is extremely early in development. Here is a link to the project (the ESP32-S3 related code is on the "dev" branc...

Magig_33_gamer

9/5/2025

where to search for SMD part names

i got a broken UNO like d1 ESP8266 it just smoke off at a mesurment event the bropen part top right is a smd A6163k as coudt ident is this the DCDC converter 6-pins so23...

Gaming

Programming

Arduino

Official Arduino Discord - Discuss all things Arduino!

Arduino

Official Arduino Discord - Discuss all things Arduino!